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Finding the Fourth Proportional to 374.90, 517.76 and 285.42

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Solution

The fourth proportional to 374.90, 517.76 and 285.42 is: 394.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.90 : 517.76 = 285.42 : x
  2. Step 2: Convert to fraction form
    374.90/517.76 = 285.42/x
  3. Step 3: Cross multiply
    374.90x = 517.76 × 285.42
  4. Step 4: Simplify right side
    374.90x = 147,779.35
  5. Step 5: Solve for x
    x = 147,779.35/374.90
  6. Step 6: Final answer
    x = 394.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.